CN105668571A - Acid washing and centrifugal dewatering technique of silicon carbide - Google Patents
Acid washing and centrifugal dewatering technique of silicon carbide Download PDFInfo
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- CN105668571A CN105668571A CN201610205741.2A CN201610205741A CN105668571A CN 105668571 A CN105668571 A CN 105668571A CN 201610205741 A CN201610205741 A CN 201610205741A CN 105668571 A CN105668571 A CN 105668571A
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- China
- Prior art keywords
- acid
- silicon carbide
- clear water
- pickling
- centrifugal dewatering
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1409—Abrasive particles per se
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses an acid washing and centrifugal dewatering technique of silicon carbide, which comprises the following steps: 1) adding clear water into an acid washing drum, starting a stirrer, and adding a to-be-washed silicon carbide abrasive-sodium hydroxide mixture; 2) while keeping stirring, adding a concentrated acid solution until the acid concentration in the drum is 8-12%; 3) continuing stirring, introducing steam until the water temperature reaches 70-80 DEG C, and boiling for 2-3 hours; 4) flushing with clear water for 2-4 hours; and 5) carrying out centrifugal dewatering at the rate of 2000-3000 r/min for 50-70 seconds. The technique can ensure the continuous production of the silicon carbide abrasive.
Description
Technical field
The present invention relates to a kind of pickling centrifugal dewatering technology of carborundum.
Background technology
In silicon carbide abrasive production process, in order to improve the content of carborundum, reduce impurity, need carry out pickling.Pickling is mainly the metallic iron of removing in drop, the impurity such as iron oxide and a part of calcium, magnesium, aluminium. Resistance to because being subject toPoor, the price of acid Material texture and in order to reduce costs the impact of factors, most domestic factory is not sour at presentWash. Dehydration procedure after pickling process, conventional dewatering has two kinds, and the one, the gravity of sand filtration bucket formula is de-Water, the 2nd, the air pressure dehydration of dehydration pot type. These two kinds of methods can cause discontinuous production technology. Dehydration procedureThe operations such as rear dry, screening, magnetic separation, fine screen, weighing, packaging have all realized mechanization and have produced continuously. OnlyHaving alkali pickling, dehydration procedure is that discontinuous is produced, and produces continuously disconnection, thereby affected abrasive material with front and back operationThe raising of production process Mechanization Level, and be unfavorable for modern management.
Summary of the invention
It is centrifugal that technical problem to be solved by this invention is to provide a kind of pickling that can quantity-produced carborundumDewatering process.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A pickling centrifugal dewatering technology for carborundum, comprises step:
1) in acid wash drum, put into clear water, open stirring machine, put into silicon carbide abrasive to be washed with hydroxideSodium mixture;
2) keep, under stirring, adding concentrated acid liquid, making the acid concentration in bucket is 8～12%;
3) continue to stir, send into steam, make coolant-temperature gage reach 70～80 DEG C, boil 2～3 hours;
4) rinse 2～4 hours with clear water;
5) centrifugal dehydration 50～70s under 2000～3000r/min.
As preferred technical scheme, described step 1) in silicon carbide abrasive mix by mass with NaOHThan being 4～5:1.
As preferred technical scheme, described step 2) in concentrated acid be the mixture of red fuming nitric acid (RFNA) and concentrated hydrochloric acid.
As preferred technical scheme, the volume ratio of described red fuming nitric acid (RFNA) and concentrated hydrochloric acid is 1:3～5.
As preferred technical scheme, described step 4) in clear water rinse after pH value be 7.
Owing to having adopted technique scheme, a kind of pickling centrifugal dewatering technology of carborundum, comprises step: 1)In acid wash drum, put into clear water, open stirring machine, put into silicon carbide abrasive to be washed and mix with NaOHThing; 2) keep, under stirring, adding concentrated acid liquid, making the acid concentration in bucket is 8～12%; 3) continue to stir,Send into steam, make coolant-temperature gage reach 70～80 DEG C, boil 2～3 hours; 4) rinse 2～4 hours with clear water;5) centrifugal dehydration 50～70s under 2000～3000r/min; Adopt technique of the present invention can ensure carborundumThe continuous production of abrasive material is uninterrupted.
Detailed description of the invention
A pickling centrifugal dewatering technology for carborundum, comprises step:
1) in acid wash drum, put into clear water, open stirring machine, put into silicon carbide abrasive to be washed with hydroxideSodium mixture;
2) keep, under stirring, adding concentrated acid liquid, making the acid concentration in bucket is 8～12%;
3) continue to stir, send into steam, make coolant-temperature gage reach 70～80 DEG C, boil 2～3 hours;
4) rinse 2～4 hours with clear water;
5) centrifugal dehydration 50～70s under 2000～3000r/min.
Described step 1) in silicon carbide abrasive with NaOH by mass mixing ratio be 4～5:1.
Described step 2) in concentrated acid be the mixture of red fuming nitric acid (RFNA) and concentrated hydrochloric acid.
The volume ratio of described red fuming nitric acid (RFNA) and concentrated hydrochloric acid is 1:3～5.
Described step 4) in clear water rinse after pH value be 7.
Below in conjunction with embodiment, further set forth the present invention. Should be understood that these embodiment are only for illustrating thisInvention and be not used in and limit the scope of the invention. In addition should be understood that read content that the present invention lectures itAfter, those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within equallyThe application's appended claims limited range.
Embodiment mono-:
A pickling centrifugal dewatering technology for carborundum, comprises step:
1) in acid wash drum, put into clear water, open stirring machine, put into silicon carbide abrasive to be washed with hydroxideSodium mixture;
2) keep, under stirring, adding concentrated acid liquid, making the acid concentration in bucket is 8%;
3) continue to stir, send into steam, make coolant-temperature gage reach 70 DEG C, boil 2 hours;
4) rinse 2 hours with clear water;
5) centrifugal dehydration 50s under 2000r/min.
Described step 1) in silicon carbide abrasive with NaOH by mass mixing ratio be 4:1.
Described step 2) in concentrated acid be the mixture of red fuming nitric acid (RFNA) and concentrated hydrochloric acid.
The volume ratio of described red fuming nitric acid (RFNA) and concentrated hydrochloric acid is 1:3.
Described step 4) in clear water rinse after pH value be 7.
Embodiment bis-:
A pickling centrifugal dewatering technology for carborundum, comprises step:
1) in acid wash drum, put into clear water, open stirring machine, put into silicon carbide abrasive to be washed with hydroxideSodium mixture;
2) keep, under stirring, adding concentrated acid liquid, making the acid concentration in bucket is 10%;
3) continue to stir, send into steam, make coolant-temperature gage reach 75 DEG C, boil 2.5 hours;
4) rinse 3 hours with clear water;
5) centrifugal dehydration 60s under 2500r/min.
Described step 1) in silicon carbide abrasive with NaOH by mass mixing ratio be 4.5:1.
Described step 2) in concentrated acid be the mixture of red fuming nitric acid (RFNA) and concentrated hydrochloric acid.
The volume ratio of described red fuming nitric acid (RFNA) and concentrated hydrochloric acid is 1:4.
Described step 4) in clear water rinse after pH value be 7.
Embodiment tri-:
A pickling centrifugal dewatering technology for carborundum, comprises step:
1) in acid wash drum, put into clear water, open stirring machine, put into silicon carbide abrasive to be washed with hydroxideSodium mixture;
2) keep, under stirring, adding concentrated acid liquid, making the acid concentration in bucket is 12%;
3) continue to stir, send into steam, make coolant-temperature gage reach 80 DEG C, boil 3 hours;
4) rinse 4 hours with clear water;
5) centrifugal dehydration 70s under 3000r/min.
Described step 1) in silicon carbide abrasive with NaOH by mass mixing ratio be 5:1.
Described step 2) in concentrated acid be the mixture of red fuming nitric acid (RFNA) and concentrated hydrochloric acid.
The volume ratio of described red fuming nitric acid (RFNA) and concentrated hydrochloric acid is 1:5.
Described step 4) in clear water rinse after pH value be 7.
Embodiment tetra-:
A pickling centrifugal dewatering technology for carborundum, comprises step:
1) in acid wash drum, put into clear water, open stirring machine, put into silicon carbide abrasive to be washed with hydroxideSodium mixture;
2) keep, under stirring, adding concentrated acid liquid, making the acid concentration in bucket is 12%;
3) continue to stir, send into steam, make coolant-temperature gage reach 70 DEG C, boil 2 hours;
4) rinse 2 hours with clear water;
5) centrifugal dehydration 70s under 2700r/min.
Described step 1) in silicon carbide abrasive with NaOH by mass mixing ratio be 5:1.
Described step 2) in concentrated acid be the mixture of red fuming nitric acid (RFNA) and concentrated hydrochloric acid.
The volume ratio of described red fuming nitric acid (RFNA) and concentrated hydrochloric acid is 1:3.
Described step 4) in clear water rinse after pH value be 7.
Embodiment five:
A pickling centrifugal dewatering technology for carborundum, comprises step:
1) in acid wash drum, put into clear water, open stirring machine, put into silicon carbide abrasive to be washed with hydroxideSodium mixture;
2) keep, under stirring, adding concentrated acid liquid, making the acid concentration in bucket is 11%;
3) continue to stir, send into steam, make coolant-temperature gage reach 78 DEG C, boil 3 hours;
4) rinse 4 hours with clear water;
5) centrifugal dehydration 55s under 2300r/min.
Described step 1) in silicon carbide abrasive with NaOH by mass mixing ratio be 4:1.
Described step 2) in concentrated acid be the mixture of red fuming nitric acid (RFNA) and concentrated hydrochloric acid.
The volume ratio of described red fuming nitric acid (RFNA) and concentrated hydrochloric acid is 1:3～5.
Described step 4) in clear water rinse after pH value be 7.
Embodiment six:
A pickling centrifugal dewatering technology for carborundum, comprises step:
1) in acid wash drum, put into clear water, open stirring machine, put into silicon carbide abrasive to be washed with hydroxideSodium mixture;
2) keep, under stirring, adding concentrated acid liquid, making the acid concentration in bucket is 9%;
3) continue to stir, send into steam, make coolant-temperature gage reach 76 DEG C, boil 3 hours;
4) rinse 2 hours with clear water;
5) centrifugal dehydration 58s under 2400r/min.
Described step 1) in silicon carbide abrasive with NaOH by mass mixing ratio be 4:1.
Described step 2) in concentrated acid be the mixture of red fuming nitric acid (RFNA) and concentrated hydrochloric acid.
The volume ratio of described red fuming nitric acid (RFNA) and concentrated hydrochloric acid is 1:5.
Described step 4) in clear water rinse after pH value be 7.
Embodiment seven:
A pickling centrifugal dewatering technology for carborundum, comprises step:
1) in acid wash drum, put into clear water, open stirring machine, put into silicon carbide abrasive to be washed with hydroxideSodium mixture;
2) keep, under stirring, adding concentrated acid liquid, making the acid concentration in bucket is 11%;
3) continue to stir, send into steam, make coolant-temperature gage reach 73 DEG C, boil 2.5 hours;
4) rinse 2 hours with clear water;
5) centrifugal dehydration 57s under 2900r/min.
Described step 1) in silicon carbide abrasive with NaOH by mass mixing ratio be 5:1.
Described step 2) in concentrated acid be the mixture of red fuming nitric acid (RFNA) and concentrated hydrochloric acid.
The volume ratio of described red fuming nitric acid (RFNA) and concentrated hydrochloric acid is 1:4.
Described step 4) in clear water rinse after pH value be 7.
More than show and described general principle of the present invention, principal character and advantage of the present invention. The industryTechnical staff should understand, the present invention is not restricted to the described embodiments, in above-described embodiment and descriptionThat describes just illustrates principle of the present invention, without departing from the spirit and scope of the present invention, and the present inventionAlso have various changes and modifications, these changes and improvements all fall in the claimed scope of the invention. ThisInventing claimed scope is defined by appending claims and equivalent thereof.
All from the present invention is to devise, the Structural Transformation of having done without creative work all drops on thisWithin the protection domain of invention.
Claims (5)
1. a pickling centrifugal dewatering technology for carborundum, is characterized in that, comprises step:
1) in acid wash drum, put into clear water, open stirring machine, put into silicon carbide abrasive to be washed with hydroxideSodium mixture;
2) keep, under stirring, adding concentrated acid liquid, making the acid concentration in bucket is 8～12%;
3) continue to stir, send into steam, make coolant-temperature gage reach 70～80 DEG C, boil 2～3 hours;
4) rinse 2～4 hours with clear water;
5) centrifugal dehydration 50～70s under 2000～3000r/min.
2. the pickling centrifugal dewatering technology of carborundum as claimed in claim 1, is characterized in that: described stepRapid 1) in silicon carbide abrasive with NaOH by mass mixing ratio be 4～5:1.
3. the pickling centrifugal dewatering technology of carborundum as claimed in claim 1, is characterized in that: described stepRapid 2) in, concentrated acid is the mixture of red fuming nitric acid (RFNA) and concentrated hydrochloric acid.
4. the pickling centrifugal dewatering technology of carborundum as claimed in claim 3, is characterized in that: described denseThe volume ratio of nitric acid and concentrated hydrochloric acid is 1:3～5.
5. the pickling centrifugal dewatering technology of carborundum as claimed in claim 1, is characterized in that: described stepRapid 4) in, after clear water flushing, pH value is 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610205741.2A CN105668571A (en) | 2016-04-01 | 2016-04-01 | Acid washing and centrifugal dewatering technique of silicon carbide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610205741.2A CN105668571A (en) | 2016-04-01 | 2016-04-01 | Acid washing and centrifugal dewatering technique of silicon carbide |
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| CN105668571A true CN105668571A (en) | 2016-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610205741.2A Pending CN105668571A (en) | 2016-04-01 | 2016-04-01 | Acid washing and centrifugal dewatering technique of silicon carbide |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06183717A (en) * | 1992-12-17 | 1994-07-05 | Hitachi Powdered Metals Co Ltd | Production of silicon carbide powder |
| CN1911798A (en) * | 2006-08-24 | 2007-02-14 | 铁生年 | Purification method of ultra fine silicon carbide powder |
| CN102320602A (en) * | 2011-08-18 | 2012-01-18 | 白山峰泰源研磨材有限公司 | Purifying method of green silicon-carbide micropowder |
-
2016
- 2016-04-01 CN CN201610205741.2A patent/CN105668571A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06183717A (en) * | 1992-12-17 | 1994-07-05 | Hitachi Powdered Metals Co Ltd | Production of silicon carbide powder |
| CN1911798A (en) * | 2006-08-24 | 2007-02-14 | 铁生年 | Purification method of ultra fine silicon carbide powder |
| CN102320602A (en) * | 2011-08-18 | 2012-01-18 | 白山峰泰源研磨材有限公司 | Purifying method of green silicon-carbide micropowder |
Non-Patent Citations (1)
| Title |
|---|
| 李学海 等: "碳化硅磨料生产中连续碱洗酸洗及脱水的研究", 《金刚石与磨料磨具工程》 * |
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Application publication date: 20160615 |